Total Trihalomethanes (TTHM) in Drinking Water
EPA Limit (MCL)
80 ug/L
EPA Goal (MCLG)
N/A
Health Guideline
0.8 ug/L
Source: EWG
Status
Regulated
Health Effects
Trihalomethanes form when chlorine used to disinfect water reacts with organic matter. Long-term exposure is linked to increased risk of bladder cancer and may cause liver, kidney, and nervous system problems.
How Total Trihalomethanes (TTHM) Gets Into Water
Created as a byproduct of water chlorination. Higher levels occur when source water has more organic matter (leaves, algae) or when more chlorine is used for disinfection.
How to Remove Total Trihalomethanes (TTHM)
Activated carbon filters (including pitcher filters and faucet-mount filters) effectively remove trihalomethanes. Reverse osmosis and aeration also work.
Recommended: Activated Carbon Filter
Granular activated carbon or carbon block filters effectively reduce chlorine, trihalomethanes, and haloacetic acids.
Up to 95% THM removal
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